code: def test_keyring():
      # mock out keyring methods and test that we are providing correct values
      # with 'datalad-' prefix
      raise SkipTest(
          "provide tests for Keyring which interfaces keyring module"
      )
  
file_path: datalad/datalad/downloaders/tests/test_credentials.py
imports: from unittest.mock import patch
  from datalad import cfg
  from datalad.api import Dataset
  from datalad.support.external_versions import external_versions
  from datalad.support.keyring_ import Keyring, MemoryKeyring
  from datalad.tests.utils_pytest import SkipTest, assert_equal, assert_false, assert_in, assert_raises, assert_true, ok_file_has_content, skip_if, with_tempfile, with_testsui
  from ..credentials import AWS_S3, CompositeCredential, GitCredential, UserPassword
label_desc: Use image node_id 3 for calling a global function with example usage: test_keyring() without return types